P, Q, R and S are metals. P reacts with dilute hydrochloric acid and produces hydrogen. Q reacts very vigorously with water. R reacts with water, giving hydrogen. S is obtained by heating its oxide with carbon. Which row identifies the metals?
- AP: copper, Q: sodium, R: potassium, S: iron
- BP: zinc, Q: magnesium, R: calcium, S: iron
- CP: zinc, Q: sodium, R: calcium, S: magnesium
- DP: iron, Q: potassium, R: sodium, S: zinc